Home : Tune Toys : Expresso 
  Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

Transformations:
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After 20 generations the expression "X" became this:
transpose(transpose((arpeggio(shuffle((transpose(arpeggio(step(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,4,6) ,12) ) ,-7) +transpose(((((arpeggio(((X|shuffle(X) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |(transpose(X,-5) |((X+transpose(X,7) ) +transpose(arpeggio(transpose(X,4) ) ,12) ) ) ) ) ) +transpose(arpeggio(transpose((transpose(X,4) +((X+X) +X) ) ,-7) ) ,7) ) |((transpose(step(arpeggio((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +(X+transpose(transpose(X,-5) ,12) ) ) ) ,12) ,-5) +transpose(echo(transpose((shuffle(echo(shuffle(X) ,4,6) ) |(shuffle(X) |((X+X) +X) ) ) ,4) ,4,6) ,4) ) +transpose(transpose(transpose((X+X) ,-5) ,4) ,7) ) ) |((transpose((shuffle(((X+transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ) |(shuffle(X) +transpose((X+X) ,12) ) ) ,4) +(shuffle(((X|X) +transpose(X,7) ) ) |arpeggio((((((X+X) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) +transpose(arpeggio((step(transpose(echo(echo(X,4,6) ,4,6) ,-7) ,12) +transpose(((((X|transpose(X,4) ) +transpose(arpeggio((transpose(X,4) |X) ) ,4) ) +transpose(((X|X) +X) ,7) ) +transpose(arpeggio(step((X+transpose(X,7) ) ,12) ) ,7) ) ,7) ) ) ,7) ) ) +(transpose(echo(arpeggio((echo(transpose(step(X,12) ,-5) ,4,6) +transpose(X,12) ) ) ,4,6) ,4) |(shuffle(transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,-7) ) +transpose(transpose(((transpose(arpeggio(X) ,-7) +transpose(X,-7) ) +(((X+transpose(X,7) ) +(X+transpose(X,4) ) ) +transpose(((X|X) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,-7) ,12) ) ) ) ,12) ) ) ) +transpose((step(step(transpose((shuffle(echo(transpose(echo((transpose(transpose((((step(shuffle(X) ,12) +transpose((transpose(X,-7) +transpose(X,4) ) ,4) ) +transpose(((X+X) |X) ,7) ) +transpose((((X+transpose(X,7) ) +(X+X) ) +shuffle(arpeggio(X) ) ) ,7) ) ,-5) ,-7) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,12) ) ,4,6) ,4) ,4,6) ) +transpose(shuffle(((transpose((X+transpose(((arpeggio(transpose(X,4) ) +transpose(transpose(((X+X) +transpose(X,12) ) ,4) ,7) ) +(((X+transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(shuffle((transpose(X,-5) |transpose(X,4) ) ) ,7) ) ) ,12) ) ,-5) +transpose((echo(((shuffle(X) +transpose(step(transpose(X,-5) ,12) ,12) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,4,6) +transpose(shuffle(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) ,4) ) +transpose(echo((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +arpeggio((arpeggio(X) +X) ) ) ,4,6) ,7) ) ) ,12) ) ,-5) ,12) ,12) +transpose(transpose((echo((((arpeggio(arpeggio((transpose(transpose(X,-5) ,-5) |(shuffle(X) |transpose(shuffle(X) ,4) ) ) ) ) |echo((step(X,12) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4,6) ) +transpose(((echo(transpose(X,-7) ,4,6) +((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(echo(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,4,6) ,-5) ,12) ) ,12) ) +transpose(((arpeggio(((X|(X+transpose(transpose(X,4) ,12) ) ) +transpose((arpeggio(X) +(X|X) ) ,7) ) ) |arpeggio((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |(step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ) ) ) +transpose((((X+(X+X) ) +shuffle(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ) +transpose(shuffle(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,7) ) ,7) ) ,4,6) +transpose((((transpose(arpeggio(transpose((transpose((((X+(X+X) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) |(step(X,12) |(transpose((X|X) ,4) +transpose(shuffle(X) ,7) ) ) ) ,-5) ) ,-5) +transpose((((transpose(shuffle(X) ,4) |shuffle(transpose(X,4) ) ) +transpose(((arpeggio(X) +transpose(X,-7) ) +transpose(transpose(shuffle(X) ,-5) ,4) ) ,12) ) +transpose(arpeggio(transpose((echo(X,4,6) +arpeggio((X+X) ) ) ,-7) ) ,12) ) ,4) ) +transpose(arpeggio(((((arpeggio(step(X,12) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,7) ) |step(transpose((transpose(X,-7) +((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) ) ,-7) ,12) ) |(arpeggio(transpose(shuffle(X) ,-5) ) +transpose(transpose(((X+arpeggio(X) ) +transpose(transpose((X+X) ,-5) ,12) ) ,-5) ,12) ) ) ) ,4) ) +transpose(shuffle((transpose(((X+transpose((step(arpeggio(X) ,12) +transpose(transpose((X|X) ,4) ,7) ) ,12) ) +step(arpeggio((X|X) ) ,12) ) ,4) +arpeggio((transpose(transpose(arpeggio(arpeggio(X) ) ,-5) ,4) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ) ) ) ,7) ) ,12) ) ,4) ,-7) ) ,7) ) ,-5) ,4)
random seed used was 177436589 EXPR = transpose(arpeggio((transpose(shuffle(transpose(transpose(((transpose(X,4) |(X+X) ) +transpose(arpeggio((X+X) ) ,-7) ) ,-5) ,-5) ) ,-7) +transpose(shuffle(((arpeggio(arpeggio(arpeggio(transpose(transpose(arpeggio(transpose((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ,-5) ) ,4) ,-7) ) ) ) +transpose((step(((((shuffle(X) +((arpeggio(X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(shuffle(echo((shuffle(X) +((step(X,12) +transpose(step(X,12) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) ,4,6) ) ,4) ) +transpose((transpose((transpose(X,-5) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) ,7) ) ,-7) |(((X|X) +transpose(arpeggio(X) ,12) ) |X) ) ,7) ) +transpose((transpose((X+shuffle(X) ) ,4) +transpose(arpeggio(X) ,4) ) ,-7) ) ,12) |transpose(transpose((step(((arpeggio(step(X,12) ) +transpose((((transpose(X,-7) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,7) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,7) ) ,12) +transpose(((((X+X) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(arpeggio(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) ,7) ) |transpose((X+X) ,-7) ) ,12) ) ,-7) ,-5) ) ,4) ) +transpose(((((shuffle((transpose(arpeggio(shuffle(X) ) ,4) +transpose(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,12) ) ) +((step(transpose(X,4) ,12) +((X+X) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) ) +transpose(((transpose((X+transpose(X,7) ) ,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ) +((shuffle(transpose(X,-5) ) +transpose((X|X) ,12) ) +transpose((transpose(X,-7) |transpose(X,4) ) ,12) ) ) ,7) ) ) +transpose(echo(transpose(((transpose(X,-5) |arpeggio(arpeggio(X) ) ) |step(shuffle((X+arpeggio(X) ) ) ,12) ) ,4) ,4,6) ,4) ) +transpose(transpose(((((arpeggio((transpose(X,-5) +transpose((echo(X,4,6) +transpose(X,7) ) ,12) ) ) +transpose(transpose(X,4) ,4) ) +transpose(step((transpose((X|X) ,-5) +arpeggio(step(X,12) ) ) ,12) ,7) ) |((((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(X,-7) ,12) ) +transpose(((X+transpose(arpeggio(X) ,12) ) +transpose(X,12) ) ,4) ) +transpose(transpose(step(arpeggio(X) ,12) ,-5) ,7) ) ) +((((arpeggio(echo(X,4,6) ) +((transpose(arpeggio(X) ,-5) +transpose((arpeggio(X) |(X+X) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) +transpose(shuffle(step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(step(step(transpose((X+X) ,4) ,12) ,12) ,7) ) |transpose(shuffle(arpeggio(X) ) ,-7) ) ) ,-5) ,7) ) |(((((((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose((shuffle(X) +transpose(shuffle(X) ,7) ) ,7) ) +transpose((step((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) |(X+transpose((X|X) ,12) ) ) ,12) +transpose(transpose(((X+X) +X) ,-5) ,12) ) ,7) ) +transpose(transpose(((step((X|X) ,12) +echo(X,4,6) ) +transpose(shuffle(transpose(arpeggio(X) ,4) ) ,12) ) ,4) ,7) ) +transpose(shuffle(arpeggio(shuffle(X) ) ) ,7) ) +transpose(transpose(shuffle(arpeggio(transpose(((transpose(arpeggio(shuffle(X) ) ,-5) +transpose((transpose(X,4) +transpose(step(shuffle(X) ,12) ,7) ) ,4) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ,4) ) ) ,4) ,4) ) +transpose(echo((arpeggio(arpeggio(arpeggio(X) ) ) +transpose((((((transpose((arpeggio(arpeggio(X) ) +transpose((arpeggio(X) |(X+X) ) ,7) ) ,4) |arpeggio(step(arpeggio(X) ,12) ) ) +transpose(arpeggio(arpeggio(step(X,12) ) ) ,4) ) +transpose((shuffle((transpose(arpeggio(X) ,-5) |transpose(X,-7) ) ) +(transpose(step((transpose(X,-7) +transpose(X,12) ) ,12) ,-5) +transpose((step(X,12) +X) ,7) ) ) ,7) ) +transpose(arpeggio((echo(arpeggio(X) ,4,6) +((echo(X,4,6) +transpose(X,-7) ) +transpose(X,4) ) ) ) ,4) ) +transpose((step(transpose(arpeggio(((X+X) +(X+transpose(X,12) ) ) ) ,4) ,12) |step(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ,12) ) ,7) ) ,12) ) ,4,6) ,7) ) ) ,7) ) ) ,7) ) ) ,-5)
random seed used was 0 EXPR = transpose(arpeggio((((((transpose(transpose(echo(transpose((transpose(X,-5) |(X+X) ) ,-5) ,4,6) ,4) ,-7) |transpose(arpeggio(shuffle(arpeggio(arpeggio(shuffle(X) ) ) ) ) ,-5) ) +transpose(((transpose((shuffle(arpeggio((X|X) ) ) +echo((X+transpose(transpose(X,-7) ,12) ) ,4,6) ) ,4) +(transpose(((X|X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-5) +transpose(((X+transpose(shuffle(X) ,12) ) |arpeggio(transpose(X,-7) ) ) ,7) ) ) +transpose(transpose((((transpose(X,-7) +arpeggio(X) ) +(shuffle(transpose(X,4) ) +transpose(shuffle(X) ,7) ) ) +shuffle(transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(arpeggio(transpose(X,-7) ) ,12) ) |arpeggio(transpose(step(X,12) ,4) ) ) ,4) ) ) ,-5) ,12) ) ,7) ) +transpose(shuffle(step(step(echo((transpose((transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,4) +X) ,-7) +shuffle((((arpeggio(X) +transpose(X,12) ) +((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) |X) ) ) ,4,6) ,12) ,12) ) ,7) ) +transpose(transpose(step(transpose(shuffle(shuffle(transpose(transpose(transpose(step(transpose((X+X) ,-5) ,12) ,-7) ,-7) ,-5) ) ) ,4) ,12) ,-5) ,4) ) +transpose(arpeggio(((transpose(transpose(shuffle(X) ,4) ,-5) +step(((arpeggio(X) |X) +transpose(step(X,12) ,7) ) ,12) ) +transpose((transpose(arpeggio(((arpeggio(X) +transpose(X,7) ) +transpose((transpose((X+X) ,4) +transpose(((X+X) |transpose((X+X) ,4) ) ,12) ) ,12) ) ) ,-7) +transpose(echo(((transpose((arpeggio(X) +transpose(X,7) ) ,-5) +transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,4) ) +transpose(((transpose(X,-5) +X) +arpeggio((X+X) ) ) ,7) ) ,4,6) ,4) ) ,12) ) ) ,7) ) ) ,4)
random seed used was 0 EXPR = transpose(shuffle(transpose(transpose((echo(((shuffle((((echo(X,4,6) +transpose(arpeggio(transpose(X,-7) ) ,12) ) +((shuffle(shuffle(X) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +X) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,7) ) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ) +transpose((((arpeggio(X) +shuffle((X+transpose((transpose(X,4) |X) ,-5) ) ) ) +((shuffle(X) +transpose(((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) +(shuffle(X) +transpose(shuffle(X) ,7) ) ) ,12) ) +echo(shuffle(shuffle(step(step(X,12) ,12) ) ) ,4,6) ) ) +transpose(transpose(((shuffle(arpeggio(X) ) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,4) ,12) ) ,12) ) |(arpeggio(((((transpose((shuffle(X) |((X+X) +transpose(arpeggio(X) ,7) ) ) ,-7) +transpose(transpose(((shuffle(transpose(X,4) ) +transpose(step(X,12) ,4) ) +transpose((transpose(X,-7) |shuffle(X) ) ,7) ) ,-5) ,4) ) +transpose((step(X,12) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(((X+((transpose(step(X,12) ,-7) |transpose((X|X) ,4) ) |transpose((X+transpose(X,4) ) ,-7) ) ) +transpose(arpeggio((((transpose(X,-5) +transpose(transpose(X,4) ,12) ) +transpose(step(step(echo(X,4,6) ,12) ,12) ,4) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ) ,12) ) ,4) ) +transpose(step(step(transpose(X,-7) ,12) ,12) ,7) ) ) |echo((arpeggio((step(X,12) |X) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,7) ) ,4,6) ) ) ,4,6) +transpose(transpose(shuffle((((((shuffle((X|X) ) +transpose((shuffle(X) +(X+transpose(X,12) ) ) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose((transpose(transpose(transpose(X,-5) ,-7) ,-7) +transpose((arpeggio((X+transpose(X,4) ) ) |transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) ,7) ) ,7) ) +transpose(echo(step((transpose(transpose(X,-7) ,-5) |(shuffle(X) +transpose(transpose(X,4) ,12) ) ) ,12) ,4,6) ,12) ) +echo(transpose(transpose(echo(X,4,6) ,4) ,4) ,4,6) ) ) ,-5) ,7) ) ,-5) ,-5) ) ,4)
random seed used was 0

The algorithm for Expresso is written in KeyKit, and here's the source code.